/***
    Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: Semaphore.Win32.cpp
    Date: 2021-6-12
    Author: Reece
***/
#include <RuntimeInternal.hpp>
#include "Semaphore.Generic.hpp"
#include "Semaphore.NT.hpp"

#if !defined(_AURUNTIME_GENERIC_SEMAPHORE)
namespace Aurora::Threading::Primitives
{
    Semaphore::Semaphore(long intialValue)
    {
        value_ = CreateSemaphore(nullptr, intialValue, 1024, nullptr);
        SysAssert(value_ != NULL, "Win32 CreateMutex Error {}", GetLastError());
    }
    
    Semaphore::~Semaphore()
    {
        CloseHandle(value_);
    }

    bool Semaphore::HasOSHandle(AuMach &mach)
    {
        mach = reinterpret_cast<AuMach>(value_);
        return true;
    }
    
    bool Semaphore::HasLockImplementation()
    {
        return false;
    }
    
    bool Semaphore::TryLock()
    {
        auto status = WaitForSingleObject(value_, 0);
        SysAssert(status != WAIT_FAILED, "Internal Win32 Error {}", GetLastError());
        return status != WAIT_TIMEOUT; // WAIT_OBJECT_0, etc
    }
    
    bool Semaphore::Lock(AuUInt64 timeout)
    {
        SysAssertExp(!HasLockImplementation());
        return WaitFor(this, timeout);
    }
    
    void Semaphore::Lock()
    {
        auto status = Lock(0);
        SysAssert(status, "Couldn't lock semaphore");
    }
    
    void Semaphore::Unlock(long count)
    {
        auto status = ReleaseSemaphore(value_, count, nullptr);
        SysAssert(status, "Internal Win32 Error {}", GetLastError());
    }
    
    void Semaphore::Unlock()
    {
        return Unlock(1);
    }
    
    AUKN_SYM ISemaphore *SemaphoreNew(int initialCount)
    {
        return _new Semaphore(initialCount);
    }

    AUKN_SYM void SemaphoreRelease(ISemaphore *waitable)
    {
        SafeDelete<Semaphore *>(waitable);
    }
}
#endif